hijack

To forcibly seize control of some vehicle in order to rob it or to reach a destination (especially an airplane, truck or a boat).

To seize control of some process or resource to achieve a purpose other than its originally intended one.

(computing) To seize control of a networked computer by means of infecting it with a worm or other malware, thereby turning it into a zombie.

(computing) To change software settings without a user's knowledge so as to force that user to visit a certain web site.

(politics) To introduce an amendment deleting the contents of a bill and inserting entirely new provisions.